Matrices and vectors are the fundamental building blocks of many of the areas of programming I find most interesting: machine learning, simulations, statistical analysis, 3D games, computer-generated art etc.

Unfortunately, using matrices presents some problems in the Clojure world. There are actually a number of really good libraries available, but they are all incompatible and designed / optimised for different use cases. Choosing the right one is hard, and a lot of effort gets wasted converting between them and duplicating code.